I think in this case, it attracts the avaricious rather than changes their beliefs. Joe Rogan can be influenced by poor lunatics as much as rich ones. As much as I can tell of peoples' opinions of the All In pod (never listened), it sounds like they were always sell-outs (or their beliefs have not strayed)
At the same time, I don't think anyone can truly understand what power does to the human brain in general and their brain specifically. It doesn't mean everyone with power is corrupt and certainly doesn't excuse those who are, but IMO it does mean one can't underestimate power's influence and assume they're one of the incorruptible "good ones"*.
* There are ways to mitigate being corruptible, such as planning ahead, delegating power to others, and finding other sources of truth besides your unreliable judgement. They're the same techniques to avoid impulsiveness, dumb crush behavior, and other mental distortions.
But you purport to? :)
Power is such a nebulous term and can mean a lot of things. Of course, persuasive power, such as by reputation or actual charisma (not the case here), is a thing. But I think also in this case, at least as much as I can glean from others, Musk already had them at hello.